loging out synaptic package manger

just trying to get mp3 files to play ---??

ProblemType: Crash
Architecture: i386
Date: Fri Mar 28 13:41:10 2008
DistroRelease: Ubuntu 8.04
ExecutablePath: /usr/bin/gksu
NonfreeKernelModules: nvidia
Package: gksu 2.0.0-5ubuntu1
PackageArchitecture: i386
ProcCmdline: /usr/bin/gksu --message <span\ weight="bold"\ size="larger">Please\ enter\ your\ password\ to\ access\ problem\ reports\ of\ system\ programs</span> /usr/share/apport/apport-gtk
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
Signal: 11
SourcePackage: gksu
Stacktrace:
 #0 0xb7b3b1dc in gdk_window_set_opacity () from /usr/lib/libgdk-x11-2.0.so.0
 #1 0xb7f98886 in ?? () from /usr/lib/libgksu2.so.0
 #2 0x00000001 in ?? ()
 #3 0x00000000 in ?? ()
StacktraceTop:
 gdk_window_set_opacity () from /usr/lib/libgdk-x11-2.0.so.0
 ?? () from /usr/lib/libgksu2.so.0
 ?? ()
 ?? ()
Title: gksu crashed with SIGSEGV in gdk_window_set_opacity()
Uname: Linux 2.6.24-12-generic i686
UserGroups: adm admin audio cdrom dialout dip floppy fuse lpadmin plugdev video